CVR Constant Volume Valve data sheet ... (PDF)
The CVR round mechanical constant air volume valves are manufactured of galvanised sheet metal and are supplied ready for installation. The air volume set point is factory adjusted but can easily be changed via an indicating dial on site. There is a built in shock absorber which eliminates any bouncing of the mechanical air volume control damper caused by turbulent air. The shock absorber provides clean air volume flow at all times. The CVR works between a minimum back pressure of 50Pa and a maximum of 1000 Pa. If a constant volume has been adjusted to 500m3/h and the operating pressure is 250 Pa and the pressure changes suddenly to 1000 Pa, the valve would adjust instantly to always provide 500 m3/h regardless of the changing back pressure. A motor driven unit is available to change the set point from remote which is ideal if a variable volume control is to be achieved. The motor can be used in conjunction with the DPC controllers and is ideal for night set back energy saving.